Door operator



Aug. 16, 1932. R. S.-PEELLE DOOR OPERATOR Filed Sept. 10, 1929 2Sheets-Sheet 1 A:TTORNEY Aug. 16, 1932. R 5 PEELLE 1,872,043

DOOR OPERATOR Filed Sept. 10, 1929 2 Sheets-Sheet 2 WZM INVENTOR V Q Mi; ATTORNEY.

Patented Aug. 16, 1932 UNITED STATES PATENT OFFICE- ROBERT S. PEELLE, FHOLLIS, NEW YORK, ASSIGNOR TO THE PEELLE COMPANY, OF NEW YORK, N. Y.,A-CORPORATION OF NEW YORK DOOR OPERATOR Application filed September 10,1929. Serial No. 891,528.

My invention relates to door operators, and more particularly tooperators for doors of the counterbalanced type.

Heretofore it has been a common practice to provide counterbalanceddoors in an elevator shaft with an electrical operator arranged in thepenthouse and controlled from a car or from the floor of a building,which operator was selectively operative as to any of the doors in theshaft for the purpose of closing and sometimes also opening same bypower.

Electrical operators have also been used which consisted of an electricmotor mounted upon thefloor side of the wall of a shaft, and geared tothe sheaves about which the flexible connections of a door passed, eachdoor being provided with such a motor and such gearing.

Door operators of the type above referred to, in which each door isequipped with a motor, have been found to be very expensive equipmentbecause of the necessity for having the motor and the gearing actuatedthereby for rotating the sheaves, upon the floor side of the shaft, thesheaves themselves being located upon the shaft side of said wall.

Furthermore, all types of electrical operators above referred torequired limit stops actuated by each door, or by a moving part of theactuating mechanism, or the exercise of extreme care by the attendantwhen either opening or closing the doors, to prevent overrunning of themotor and possible resultant injury to the doors or to the motor.

My present invention embodies some of the characteristics of each typeof door above specified, in that each door in a shaft is provided withits own motive power for opening and closing same, but the actuation ofthe various motors is selectively controlled by a mechanism in thepenthouse in conjunction with mechanisms in the shaft and in theelevator car.

In an operator embodying the invention, the construction is such thatthe motors for imparting opening and closing movement to the door may belocated within the shaft, each motor being geared directly to a sheave,

. so that no openings through the wall need be made when installing theoperator. These taneous movement of both sheaves.

By using two motors as above described, the horsepower of each motor maybe very low, smce the total load which must be carr ed by both motors isequal merely to the difierence in weight between the two sections of adoor, which'will never be more than a few pounds, and may even benegligible.

The mechanisms used for controlling the application of power to thesemotors are such that while a single electrical control mechamsm may beused in the penthouse, the operative effect of setting this mechanism,by means of a switch upon the car, on a floor, or for themicro-mechanism, will be merely to cause power to be; applied to themotors of one door, the circuit to the motors of all other doors in theshaft remaining open.

The manner of connecting the doors is such that no exactitude in thetiming of the operation of the motor is required, since the operativeeffect of the motors upon the door is determined by the opposed weightof the two sections. 1 provide, however, a master limit switch as a partof the control mechanism in the penthouse, by means of which a timelimit is placed upon the operation of the control switch mechanism as awhole during the opening movement of the door only, so as to precludeany possibility of overrunning of I the upper door section in a mannerto cause injury to the sheave structure and the motors.

The electrical control mechanism is so constructed that under normalworking conditions, when it is desired to open a door, the closing ofthe opening switch in the car, or on the floor, or of themicro-mechanism control, will establish an electrical condition whichwill continue for the full interval of the time for which the masterlimit switch is set. A constant pressure switch, however, is used formaintaining the control mechanism in operative relation during the fullclosing movement.

The arrangement of'the control mechanism is also such that if desired,all of the control switches may be made inoperative while'powtheelevator car. This arran ement is for Y tlbor operator of my invention,this feature forms .8 P rt of the control mechanism for operatingthe'doors and has nothing to do with the controls for the elevator: caritself.

The invention consists primarily in a door operator embod ing thereinthe combination with guides wit in a n elevator shaft, a-series ofelevator doors each having sections vertically and opppsitely movable onsaid ides, connections tween said sections at t e opposite sidesthereof, and sheaves about which said connections pass, of an electricmotor within the shaft associated with a sheave, gearin connecting saidmotor with its associate sheave, a main electric power line extendingadjacent all of-said doors, a branch line extending therefrom adjacenteach door and connected with the motor adjacent such door, a normall 0en switch in said branch line, means carried y an elevator car adaptedto co-operate with any of said normally open switches, whereby thecircuit from sai main line to a motor 0 erative upon any door can beclosed only w en a car is positioned a djacent said switch, pole chan'ng switches controlling the circuits to sai main power line,electro-magnetic control mechanisms for said pole changing switches, andmeans whereby said control mechanisms may be I selectively actuated froma remote point; and

in such other novel features of construction and combination of pzrts asare hereinafter set forth and descri d, and more particularly ointed outin the claims hereto appen ed.

Referring to the drawin s,

Fig. 1 is a view of an e evator shaft door equipment vertically andlaterally condensed, with the penthouse switch and control mechanismindicated conventionally;

Fig. 2 is a side view from the right of Fig. land upon a larger scale,showing one sheave mechanism and its motor;

Fig. 3 is an electric diagram showing the penthouse switch and controlmechanism, the various remote controls for the circuit and the actuatingmotor circuits for a single door; and

Fig. 4 is a horizontal section above a door, the door being in an openor partially open position.

Like numerals refer to like parts throughout the several views.

The operator of my invention is for use in positively o ning and closingfreight eleva tor doors 0 a type well known as counterbalanced doors thedetailed construction of which doors is immaterial to the invention.

teams I In the drawings, I have illustratedtwo terbalanced doorinstallations, then to the ar-- rangement of parts for opening andclosin any selected door, and finall to the electrica conditions forcontrolling the application of power to the door opening andclosing'mecha nism, incidental reference being had to the movements ofthe car without a detailed description of the same.

In counterbalanced elevator doors, as shown in the drawings, acontinuous guide rail structure is positioned upon the inner wall of theshaft at each side of the door openings, each guide structure comprisinga wall angle 10 having secured thereto a guide angle 11. Each doorconsists of two sections, each of approximately the same weight as theother, although either section may be overweighted as compared with theother In the drawings, the upper section of the upper door is indicatedat 12, and the lower section at 12a. In the lowerdoor shown, the

' upper section is indicated at 13, and the lower section at 13a. Eachlower section 12a and 13a has the usual hanger bar and truck railstructure indicated at 14 as to each door, the ends of which projectacross and beyond the uide rail structure so as to engage what is own astrucking stops 15 secured to the wall angle 10 of each guide railstructure.

During the opening and closing of the door,

.the two sections are vertically and oppositely movable by reason of theuse of connections between the sections which ordinarily consist of aturn buckle bar 16 connected with the hanger'bar of the lower doorsection, and a link chain 17 connected adjacent the lower edge of theupper door section, the hanger bar being a part of the to bar of thelower door section. The chain 1 door passes over a sheave 18, a housingfor which is secured to the wall angle, the axis of this sheave beingperpendicular to the wall of a shaft, and the sheave in its entiretybeing positioned at one side of the path of movement of the upper doorsection in order to permit the'opemng and closing movement of thissection.

Ordinarily, when it is desired to permit the automatic actuation of suchdoors, a locking mechanism is used-which may be actuate from the car andwhich co-operates with the at each side of a hanger bar of the lowerdoor section at each side of the opening. Such a locking mechanism isshown conventionally at 19, but this locking mechanism is not essent alto a door equipped with the operator of my present 1nvention.

The connections, sheave and lock mechanisms above described areduplicated upon opposite sides of each door.

The wall of the elevator shaft about the door openings is shown at 20.The bracket supporting the sheave housing is shown at 21.

The parts and mechanisms above descrlbed merely relate to one well knowntype of elevator door, and are subject to wide variation withmodifications of this type of door.

My present invention has to do with a power mechanism associated witheach door by which both opening and clos ng movement may be imparted tothat door, the mechanisms associated with the various doors receivingtheir power from a common source selectively controlled so as to limitits operative effect to a particular door opening.

The use of individual, separately controlled operators for each door ina shaft is old, the present invention relating to a particularconstruction and arrangement of the power operating mechanism inrelation to the door, and the means for controlling .the appllcation ofpower to any such mechanism.

As shown in the drawings, my inventlon involves the use of two smallelectric motors secured to the door guide structure which includes theguide angles 11, the wall angles and the plates 21 respectively. Sincethe sections as 1212a of a door are approximately balanced as to weight,it is obvlous that each of these motors may be of very low I-I. P., thesize of motor being largely determined by the dimensions and weight ofthe doors and possible variation in the weights of different sections ofthe door. With the ordinary door, I have found that a motor of H. P. isadequate to meet the varying demands of a standard equipment and allow asufiicient margin of safety. This motor is set with its shaftperpendicular to the wall of the elevator shaft.

The motor to the right of the door, as. seen from the inside of theelevator shaft, is indicated at 22, and that to the left, at 23. Theshaft of the motor 22 is indicated at 24, and that of the motor 23 at25.

Upon the shaft 24 is mounted a small gear 26, enmeshed with a large gear27 which is permanently secured to the flange of the sheave 18positioned toward the wall of the elevator shaft. The motor 22 is set asclose to the gear 27 as is practical so that it may be as nearly aspossible, positioned in its entirety within the shaft. With narrowdoors, however. it may be necessary for the erection gang to form arecess in the wall to accommodate a part of the motor, as shown in Figs.

2 and 4 of the drawings. This condition is particularly true when thindoors are used although when thicker doors and larger wall angles areused it may be possible to avoid the cuttin of the wall.

The ratio of the ears 26 and 27 may vary it being necessary, owever, inthe design of the operator, to provide for a speed reduction to avoid atoo rapid movement of the doors when opening or closing same. The gear27 preferably 1s of a diameter approximately that of the flange of thesheave.

The shaft of the motor 23 carries a. small gear 28 corresponding withthe gear 26 which meshes with a gear 29 corres ending with the gear 27and secured to the s eave 18 with which the motor 23 is associated.

Spur gears are used in order to effect a re id opening and closing ofthe door.

0th motors are reversible and ma be of any desired desigp, it beingessential 0 course that each shall ave substantially the same speed as,and be so wired as to normally turn in a direction opposite to that of,the other.

It is to be noted that each of the motors 22 and 23 is positionedwithout the path of movement of the upper door section as 12 or 13, andthat the gearin connecting same with the sheave with whic the motor isassociated is also without the path of such movement.

One of the difliculties in the use of individual operators for elevatordoors of the counterbalanced type has been the impossibility of using aearing for operatin sheaves positione upon the shaft si e of the wall ofthe elevator shaft which can Si? multaneously act upon both sheaves.These sheaves being located in substantial alinement with the plane ofmovement of the upper door section, and closely adjacent the top of thissection, any attempt to use mechanical gearing connecting the twosheaves would require the locating of this gearing within the plane ofmovement of the upper door section, which is impossible.

Elevator doors of the counterbalanced type are used because they occupvery little space in the shaft. The face 0 the doors presented towardthe shaft is set so close to the wall as to present no space, betweenthe plane of movement of the door and the wall, in which to locategearing passing across from one guide rail to the other. On the otherhand, the shaft side of the doors is located so close to the lane ofmovement of the front edge of the e evator car, that no space isafforded between the door and the car platform for the location of suchmechanism. Furthermore, even if a shaft could be run across the elevatorshaft above a door opening, the gears carried by this shaft wouldproject to an extent to interfere with the travel ofthe car. It is forthis reason the that heretofore, in one type of door operatingmechanism, a single motor and-connecting gearing between same and thetwo sheaves of a door were always located upon the floor side of theshaft wall and connected with the sheaves b means of a shaft passingentirely through the wall.

In an operator embodying my invention, the motors and the gearingconnecting same with the sheaves of a door, are not only in theirentirety within the shaft, but within the space occupied by the door andthe guide rail structure, and the labor of piercing the wall andaccurately setting the shaft connecting the gearing with the sheave isavoided.

The electrical system forming a part of the operator will vary with thetype of motor used and the character of the current. In the drawings Ihave shown multiple-phase, A. C. motors. With this type of installation,I employ a main electric power line having three wires 30, 31 and 32which extend throughout the entire height of, and adjacent all doors in,the shaft. Adjacent each door there are three branch lines 33, 34 and 35connecting in parallel the two motors 22 and 23, the connections beingsuch, however, that said motors are, with the closing of the circuit ofthe main power line, rotated in opposite directions, see Fig. 3.

Controlling the circuits to said main power line is a pole changingswitch mechanism consisting of two groups of three switches each, theclosing of one group of switches applying power to the motors 22 and 23under a suitable control, which will later be described, to cause arotation of the motors 22 and 23 in a direction to cause the sheaves 18to raise the upper door section and permit the lower door section todescend. The other group of switches, when closed under suitablecontrol, will cause a reversal of the direction of rotation of themotors 22 and 23, and of the sheaves 18, thus raising the lower sectionwhich will permit the upper section to descend.

The first group includes switches] 36, 37 and 38, one of the contacts ofwhich is connected with the main power line through leads 39, 40 and 41,and the other contact of which is connected through lines 42 43 and 44to the source of power through lines 45,

46 and 47. The other group, which is used nate door opening switches andthe switches 48, 49 and 50 I shall designate door closing switches.

With the electrical system .shown in the drawings, one of the wires ofthe main power line as 30 is in constant connection with both motors 22and 23, either through the hue 35 or through a lead line as 35a, as tothe motor 22. The branch lines 33 and 34 are also adapted to beconnected with both motors, either directly or through the lead lines33a and 34a, as to the motor 22, by means of a normally open switchmechanism 54, which I shall call a shaft switch, having fixed contactscommunicating with the wires 31 and 32 respectively through theelectrical connections 33b and 34b, and contacts carried by a movablecontact member 55, which contacts are in direct electrical connectionwith the branch lines 33 and 34. A shaft switch 54 is located adjacenteach door in a shaft and is adapted to be actuated by a shoe shownconventionally at 56 which is carried by the elevator car. This shoe maybe a fixed shoe or a receding shoe as desired.

It will be noted that the use of the shaft switch 54, in the branchlines from the main circuit leading to the motors operative upon therespective doors, will prevent the application of power to the motorsoperative upon all doors in a shaft, even though a door opening orclosing switch in the main power line may be closed, In other words, themain power line will remain dead at all times, unless one of the shaftswitches 54 is closed, notwithstanding the actuation of the door openingor closing switches.

Each of the door opening orclosing switches controlling the circuit fromthe source of power to the main power line has an actuating means, whichincludes what is known as holdin circuits, and electro-magnetic controlmec anisms, one for each group of switches.

The actuating means for the door opening or closing switches comprisestwo electromagnets 57 and 58, the armature 59 of the former of which isoperative upon the movable contact niembers 36, 37 and 38 of the dooropen ng switch, while the armature 60 of the latter of which magnets isoperative upon the movable contact members 48, 49 and 50 of the doorclosing switch.

These magnets may be energized from the main source of power throughremote control switches, one of which is located in the elevator car,and others of which may be located at different floors of a building, inthe penthouse or in the engine room, as desired.

These different remote controls are selectively operative, and theactuation of any control will have the same operative efl'ect as to theapplication of power to the motors for opening or closing a door.

' tionally.

I will first describe the control switch mechanism in the elevator carcalled the car switch and the various circuits controlled thereby, firstfor opening the door and then for closing the door.

The car switch is shown at 61 and includes a normally open open'ngswitch of the usual or any desired construction indicated at 62, anormally open closing switch 63 and a normally closed stop switch 64.These are bridge switches, and one of the fixed contacts of eachswitchis in electrical connection with a fixed contact of both of the otherswitches as by means of wires 65 and 66. In

this manner the circuits controlled by the "electrical connectionthrough the lines 67 and 68 with the line 42, and the other terminal isin electrical connection with the line 44 through the line 69, theopening switch 62, the wires 65 and 66, the normally closed stop switch64 and the line 70. The contact of the stop switch 64 with which thewire. 66 is connected, is in electrical connection through the line 71with the winding 72 of an electro-magnet forming a part of what is knownas a master time limit switch 73, the mechanisms of which are indicatedconven- This time limit switch contains normally closed contact members74, one of which is connected with the winding of the electro-magnet 72,and the other of which is connect-ed by theline 75 with a fixed contactof a switch 76, the movable contact of which is acted upon by thearmature 59 and is in electrical connection through the lines 77 and 69with the winding of the electro-magnet 57.

The time limit switch 73 is specifically not my invention, but may beobtalned upon the open market in various forms, it being old and wellknown in the art. I will therefore describe it merely generally and haveshown it merely conventionally.

In one form of master time limit switch, the electro-rnagnet 72 is asolenoid, the core of which is connected with a cross bar 78 having tworods 79 and 80, the first of which acts upon a compression spring 81,and the second of which is connected with the plunger of a dash pot 82.This dash pot is so constructed as to resist the movement of the plungeroutwardly of the dash pot cylinder which is provided with an adjustablevent opening by which this resistance will be gradually decreased, foran interval determined by the size of the opening, until the plunger hasmoved a predetermined distance necessary to open ports through thecylinder of the dash pot and thus instantly relieve the sub-atmosphericpressure within the cylinder and permit the free movement of the 5plunger.

The movable contact member of the normally closed switch 74 is carriedby an oscillatory lever 83, one arm of which is acted upon by the spring81, and the other arm of which 1s acted upon by a spring 84 opposed tothe spring 81. The operative effect of this spring 84 is to normallyovercome the tension of the spring 81 and close the contacts of theswitch 74.

Qne terminal of the winding of the magnet '15 58 1s 1n electricalconnection with the lines 68 and 45. The other terminal is in electricalconnection through a line 85 with one of the fixed contacts of theclosing switch 63, the other fixed contact of which is in electricalconnection through the wire 66, the stop switch 64 and the line 70 witha plus line such as 44.

. The circuits heretofore described have partlcular relation tothecontrol ofthe door opening and closing switches by the car switches. Inaddition to so controlling said door openmg and closing switches by thecar switches, they may be also controlled by the micromechanism control,whether the same be manual or automatic and by what is known as floorcontrol switches, which may be actuated from the floor side of theshaft.

When it is desired to actuate the door as a result of the actuation ofthe micro-mechanism control, I provide a normally open switch mechanism86, the fixed contact of which is, connected to the line 44 by the line87, and the movable contact of which is connected with the line 69 bythe line 88. The movable contact of the switch mechanism 86 is actedupon by an electro-magnet 89, arranged in circuit with two of theterminals of'the micro-motor shown conventionally at 90. This motorshown in the drawings is of the same type as the motors 22 and 23, andhas three leads 91, 92 and 93, the leads 91 and 92 being at all times ofopposite polarity, and being in electrical connection with the windingof the ,electro-magnet 89 through the lines 94 and 95.

While there is only one car switch mechanism 61, there are a pluralityof floor switches, one of which is shown at 61a. This switch is in allrespects identical with the car switch mechanism 61, having an openingswitch 62a, a closing switch 630 and a stop switch 64a. Connected withthe lines 69, 70, 71 and 85 respectively are branch lines 69a, 7 0a, 71aand 85a which extend throughout the height of the shaft. The line 69a isconnected by a branch line 696. with one of the contacts of the openingswitch 62a. The line 71a is connected by the branch line 715 with one ofthe contacts of the stop switch 64a. The line 7 0a is connected throughthe line 7 0b with one of the contacts of a switch mechanism 96 having amovable contact member adapted to be engaged by a shoe upon the car, and

through said switch mechanism 96 and the line 700 with the other contactof the stop switch 64a. The line 85a is connected with one of thecontacts of the closing switch 63a by the line 85b.

The wiring of each hall switch is therefore identical with the wiring ofthe elevator car switch, with the exception that the normally openswitch in the line to the stop switch will prevent the closing of any ofthe control circuits by the actuation of the hall switch unless a car isin a position at the floor where a particular floor switch is located soas to close a switch 96.

When floor switches are used, it is des1rable to prevent the opening ofany door until the elevator is located and at rest at a particularfloor. This is due to the fact that when floor switches are used, noattendant travels in the car, a floor" control mechanism being used bywhich the car may be started, when the conditions are such as isrequired by the car operating mechanism, and caused to travel to someparticular floor.

Ordinarily, all freight elevator doors are equipped with what is knownas an electrical interlock, which is a mechanism actuated as a result ofthe partial opening and complete closing of a door which will controlthe application of power to the car.

To guard against what is known as the stealing of the car, or theinterruption of the power for actuating the car while the car is intransit from one floor to another predetermined floor by the opening ofthe doors as the car passes an intermediate floor, I provide a switchmechanism in the line 70 which will be normally open while the car is inmotion, but will be automatically closed when the car comes to rest atany floor.

In the accompanying drawings, this switch mechanism is shown at 98 andis arranged in the line 7 O. The movable contact member of this switchis acted upon by an electro-magnet 99, energized by the circuit to theelectric motor 100 for imparting travel to the car. This motor 100 is ofthe same type as the motors 22 and 23, and has three leads 101, 102 and103. the leads 101 and 102 being at all times of dissimilar polarity andbeing in electrical connection through the lines 104 and 105 with thewinding of the electromagnet 99. v

The switch 98 need be used only when floor switches are used, since whenthe car switch 61 is used, the switch mechanism 54 will prevent theapplication of power for opening or closing a door until the car is in adesired position.

My present invention has to do only with the electrical mechanism of adoor operator, and I have, therefore, neither shown nor described any ofthe various mechanisms or attachments with which such doors may beequipped for purposes other than controlling their operation. Such otherattachments and devices are numerous, are sub ect to wide variation andare well known.

The operation of the herein described door operator is substantially asfollows:-

When a car is a proaching a floor and all the doors in a sha t areclosed, the electrical conditions as to each door and in the penthousecontrol mechanism will be as shown in Fig. 3, the movable contactsof thedoor opening switch 36, 37 and 38, the door closing switch 48, 49 and 50and the shaft switch 54 being open, and the switch 74 of the time limitswitch 73 being closed. The stop switch 64 is normally closed, and theopening and closing switches of the car switch mechanism 61 are normallyopen.

As a car comes to rest at a door opening, the switch 54 is closed,either manually or automatically, through the shoe 56, thus connectingboth motors 22 and 23 with the main power line 30, 31 and 32 extendingthroughout the shaft. When the switch 98 is used, this will also beclosed under these conditions.

It being desired to open a door, the attendant merely punches, or forcesin, the contact member of the opening switch 62. With the closing ofthis switch, current will flow from the line 47 through the lines 44 and70, the stop switch 64, the wires 66 and 65, the opening switch 62, theline 69, the winding of the electro-magnet 57, and lines 67 and 68 tothe negative lines 42 and 45. This will energize the electro-magnet 57,the attraction of the armature of which will close the dooropeningswitches 36, 37 and 38 and also the switch 76. The closing of theswitches 36, 37 and 38 permits current to flow through the lines 45, 46and 47, the lines 42, 43 and 44, said switches 36, 37 and 38, the lines39, 40 and 41 respectively and the main power lines 30, 31 and 32. Theswitch 54 being closed. power will flow from the main power line throughthe branch lines 33, 34 and 35 to the motors 22 and 23 respectively,thus simultaneously actuating both of these motors.

By reason of the wiring of the motors, the motor 22 will have clockwise,and the motor 23 will have contra-clockwise movement, thus actuating thesheaves 18 at. opposite sides of the door so as to exert a pull upon thechains 17, and raise the upper section, as 12, of a door whilepermitting the lower section 12a of that door to descend until thehanger bar 14 thereof engages the truck bar stops 15. The sheave 18 atone side of the door will be rotated by the gears 26 and 27 and actuatedby the motor 22 in one direction, and the sheave 18 at the other side ofthe door will be rotated by the gears 28 and 29 and actuated by themotor 23 in the opposite direction. Since the sections 12and 12a of 1 6(1001 are substantially counterbalanced,

the power required for imparting this movement thereto is low. As thehen er bar 14 engages the truck stops 15, if t e sheaves should berotated beyond thatrcqurred to impart a full opening movement to thedoor, slippage can occur between each sheave and the co-operating chain17 m a manner to prevent excess movement of the door. It 15 desirable,however, to prevent this condition, or at least to limit it to as shortan interval as possible, and it is for this reason that I provide thetime limit switch 73.

It is desirable, when opening a door, for the door to have continualmovement without the use of a constant pressure opening switch in thecar. In other words, it is desirable that the attendant shall berequired to merely quickly push in the movable contact member of theopening switch, and then instantly release it and still have the holdingmagnet 57 continue to be energized for a time interval suificient toensure the complete opening movement of the door, or a predeterminedamount of opening movement. The time limit switch 73 is used for thispurpose. When the electro-magnet 57 is energized, the movable contact ofthe switch 76 will be actuated to close a circuit which will energizethe winding 72 of the electro-magnet of the time limit switch 73. Thecircuit for energizing this winding 72 will be from the line 47, throughthe lines 44 and 70, stop switch 64, line 71, winding 72, switch 74,line 75, switch 76, line 77. line 69, the winding of the electro-magnet57 and lines 67, 68 and 42 to the negative line 45. Hence the actuationof the opening switch 62 willmomentarily energize the electro-magnet 57.The energizing of this electro-ma-gnet 57 will not only close the dooropening switches 36,37 and 38. but will also cause the winding 72 of theelectro-magnet of the time limit switch to be energized at the sametime. closing a circuit through the stop switch 64 to the electro-magnet57 so as to cause it to cont nue to be energized notwithstanding theinterruption of the circuit at the switch 62.

As the electro-magnet 72 is energized, the traction of this magnet willbe applied through the core and cross bar 78 to the spring 81 and theplunger of the dash pot 82. Outward movement of the cross bar 78 and therods 79 and 80 will be resisted by the sub-atmospheric pressure orsuction within the cylinder of the dash pot, so that the outwardmovement of the plunger of the dash pot will be resisted and yet thisplunger will have a very slow movement. The time interval be fore thesub-atmospheric pressure. within the cylinder of the dash po't'isrelieved by the opening of the cylinder ports as a result of themovement of the plunger, may be accurately determined by the calibrationof the vent opening in said cylinder. As soon as the pressure, however,is relieved, the cross bar 78 will be moved rapidly, thus-developingsuflicient tension in the spring 81 to overcome the tension in thespring 84 causing rapid movement of the lever 83 and the interruption ofthe circuit at the switch 74. This will immediately de-energize theelectro-magnet 57 and also the electro-magnet 72. Consequently, thespring 84 will immediately close the switch 74.

The de-energizing of the electro-magnet 57 will result in theinterruption of the circuits controlled by the switches 36, 37, 38 and76, so that all of the circuits will be interrupted and will remaininterrupted until the switch 62 has been again actuated. If the timeinterval for which the time limit switch 73 has been set is sufiicientto permit the complete opening of the door, a further actuation of theswitch 62 is unnecessary. If the time interval e is not sufiicient,however, a second actuation of the switch may be necessary. The switch54 will remain closed so long as the elevator car is at the dooropening.

When it is desired to close the door, the closing switch 63 is actuatedby the attendant. This is preferably a constant pressure switch, or onewhich requires the attendant to manually hold it closed during theentire closing movement of the door. This is desirable. There is littleor no element of danger in opening a door. In clos ng a door there is anelement of danger, particularly in a rapidly moving door, and by the useof a constant pressure switch the movement of the doors may be stoppedinstantly by merely releasing the switch.

When the switch 63 is actuated, the electromagnet 58 will be energized,the circuit to this magnet being from the line 47, through the leads 44and 70, the stop switch 64, wire 66, closing switch 63, line 85 to oneterminal of the winding of the electro-magnet 58, from the otherterminal of this winding, through the lines 68 and 42 to the minus line45. This energizing of the electro-magnet 58 will, through its armature60, actuate the switches 48, 49' and 50 to close the circuit through thelines 51, 52 and 53 and the lines 40, 39 and 41 respectively, to themain power lines 31, 30 and 32 respectively, and through the switchmechanism 54 and the branch lines 33, 34 and 35 to the motors 22 and 23respectively.

It will be noted that by the closing of the switches 48 and 49, thepolarity of the current in the wires 30 and 31 of the main power line isreversed, thus causing a reversal of the direction of movement of themotors 22 and 23. Except for this change of polarity in the current intwo of the wires, the circuit from the wires of the main power line tothe motors 22 and 23 will be as heretofore described. The instant thatthe attendant releases the closing switch 63, the circuit to theelectromagnet 58 will be interrupted, and the various switches 48, 49and 50 will automatically It is to be noted that the t1me hmlt switch 573 is not operative during the closing of the and that the operativeefl'ect of the sheaves u on this chain is dependent upon the weight 0?the two door sections at opposlte ends of the connections passing aboutthe sheaves.

The minute that the lower door section comes to rest upon the truck barstops 15, the weight upon one side of the sheaves is relieved, and thesubsequent application of power to the sheaves will merely result inrelievin the frictional engagement between the s cave and the chain toan extent to prevent further movement of the upper door section to anappreciable extent. The use of the time l1m1t Switch is to minimizepossible overrunnin of the sheave and preclude any possibility 0possible injury to the sheave and to the operator motors in the eventthat through accident, conditions should develop which would result inoverrunning of this up r door section. Furthermore, the time limitswitch permits the use of a single control for limiting the operation ofthe actuation of any operator motors for a series of doors in a shaft,which very much simplifies and cheapens the installation since it avoidsthe use of individual time limit switches operated by each door.

If for any reason it is desired to interrupt the opening movement of adoor, it is merely necessary for the operator to actuate the stop switch64, which will immediately interrupt all circuits in the operator, sincethe current for all circuits passes through this switch, excepting thatof the initial opening circuit, due to the actuation of the openingswitch 62. If the operator be used in an automatic elevator, or one notrequiring the presence of an attendant in the car, a switch 61a ispositioned on each floor. When a car approaches a floor, it actuates themovable contact member 97 This closes the switch 96 which will remainclosed while the car is at the adjacent floor. The opening switch 62a,the closing switch 63a and the stop switch 640: may be actuated with thesame results as the actuation of the switches 62, 63 or 64 of the carswitch 61. A repetition of the circuits is unnecessary. I J

The switch 98 is used when hall switches are included in aninstallation, to prevent the so-called stealing of a car, as beforedescribed. When a car switch only is used, the presence or absence ofthis switch is immaterial, since it will always be closed whenever it isrequired to actuate a switch in the car. When a hall circuit is used,however, it is desirable to prevent the actuation of any then the switch98 will automatically close so that power may be applied to theoperator. The switch 98 is not to be considered as a remote operatingcontrol, but merely as a safety factor for reventing the unauthorizedactuation of t e operator.

The micro-control, however, is a remote control for the operator and maybe used in con unction with the car or hall switch mechanism. Thepurpose of this micro-control is to relieve the operator of the necessitof actuating the opening switch 62, if the micromechanism control beused, or in the event of an automatic micro-control bein used, to

cause the actuation of this mechanism to be also effective in actuatingthe door operator. When the circuit to the micro-mechanism is closed inany manner, the winding of the electro-magnet 89 will be energized, thusclosing the switch 86. The closing of this switch will set up a circuitfrom the line 47, through the line 44, line 87, switch 86, line 88, line69, magnet winding 57, lines 67, 68 and 42 to the negative line 45. Theefiect of energizing the electro-magnet 57 as a result of the closing ofthe switch 86, will be the same as when this magnet is energized as theresult of the closing of the opening switch 62. The actuation of themicro-mechanism is like that of the actuation of the switch 62, merelymomentary.

Following the energizing of the electro magnet 57 as a result of theclosing of the switch 86, circuits will be established the same asdescribed in connection with the actuation of the switch 62, the initialclosing of the circuit bringing into operation the time limit switch 73with the same results as when the electro-magnet 57 is energized by theactuation of the switch 62.

The wiring connections of the electro-m agnet 89 are such as to ensurethe energizin of the winding of the magnet irrespective o the directionof rotation of the motor by the micro-mechanism.

When a car leaves a floor, the shoe 56 will be disengaged from themovable contact 55, thus opening the switch 54 and interrupting thecircuit to the motors 22 and 23.

If the switch 98 be used, the application of power to the car willautomatically interrupt all of the circuits controlled by the openingand closing circuits, to ether with the control circuits for said switces and the circuit to the master time limit switch. The use of thisswitch 98, however is desirable' only with so-called automaticelevators.

It is to be noted that by the use of the master time limit switch 73,the quantity of movement of any door in a shaft may be controlled by asingle mechanism which may be located in the penthouse andform a part ofthe switchboard.

It will be noted that in an operator embodying the invention, each dooris provided with its individual electric motor-driven mechanism for bothopening and closing the door, and that a single mechanism forcontrolling the application of power to said i11- dividual motorequipments is used.

As heretofore stated, the master time limit switch 73 is used only inthe holding circuit for controlling the door opening switch, and

a constant pressure switch is used in the holding circuit for operatingthe door closing switch. This is desirable in order to have the openingof the door a continuing movement requiring only the manual operation ofa control to initiate the movement, thus leaving the car operator freeto do other things upon the car arriving at a given floor. When closinga door, however, it is desirable to have the operators attentionconcentrated upon the doors to avoid possible accident, so that theconstant pressure switch may be advantageously used for controlling theholding circuit of the door closing switch.

It will be noted that the car switch mechanism 61 is a movable remotecontrol, and that the various floor switches 61a are fixed remotecontrols, as is the micro-switch mechanism 86 and the. car motor switchcontrol mechanism 98. The control switch mechanisms 61 and 61a and themicro-switch mechanism 86 may all be used in the equipment, but arealternatively operable.

The switch mechanism 98 is used only when floor switches are used andhas no operative effect whatever when a car switch 61 only is employed.

In the event of the interruption of power to any door, the constructionherein described will permit the manual opening of that door, sinceunder such conditions the sheaves are either permitted to turn freelywith the rotor of the motor, or the chains 17 will have slippage inrelation to the sheaves in the event of the jamming of the motor. Thiscondition will exist as to all doors in a shaft in the event of theinterruption of the main source of power for the operator. With apenthouse motor, this manual operation is impossible withoutconsiderable work in order to make the operator inoperative as to all ofthe doors in the shaft, or any door which was required to be opened.With a door of light weight, in the event of failure of one of themotors, the remaining motor will still operate the door.

It is not my intention to limit the invention to the details ofconstruction shown in the accom anying drawings. The wiring diagram ofig. 3 is applicable to a particular construction of motor 22 or 23 andwill be varied when motors of other types are used.

Having described the invention, what I claim as new and desire to haveprotected by Letters Patent, is

1. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sect-ionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line extending adjacent allof said cores, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent sa'd switch,.pole changing switches controlling thecircuits to said main power line, electro-magnetic control mechanismsfor said pole changing switches, and means whereby said controlmechanisms may be selectively actuated from a remote point.

2. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sectlons at the opposite sides thereof, and sheaves. about whichsaid connections pass, of an electric motor Within the shaft assomatedwith each of said sheaves, gearing connectmg each of said motors withits associated sheave, a main electric power line extendlng adjacent allof said doors, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent said switch, pole changmg switches including dooropening switches and door closing switches controlling the circuits tosaid main power line, electro-magnetic control mechanisms associatedrespectively with said door opening and said door closing switches, 'amaster time limit switch, including a normally closed switch mechanism,an electro-magnet operative thereon and in circuit therewith, and aswitch controllable by the electro-magnetic control for said dooropening switches and in circuit with the electro-magnets of said mastertime limit switch and the electro-maga net of the control for said dooropening switches, and means whereby the control mechanism for said dooropening and said door closing switches may be selectively actuated froma remote'point.

3. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line extending adjacent allof said doors, branch; lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent said switch,

pole changing switches controlling the circuits to said main power line,electro-magnetic control mechanisms for said pole changing switches, anda remote control for said control mechanisms embodying therein a carswitch mechanism including a normally open opening switch in circuitwith the electromagnet of one of said pole changing switches, and anormally open closing switch in circuit with the electro-magnet of theother of said pole changing switches.

A door operator embodying therein the combination with guides within anelevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and

sheaves about which said connections pass,

of an electric motor within the shaft associated with each of saidsheaves, gearing connecting each of said motors with its associatedsheave, a main electric power line extending adjacent all of said doors,branch lines extending therefrom adjacent each door and connected withthe motors adjacent such door, a normally open switch in each of saidbranch lines adapted to be operated only when a car is positionedadjacent said switch, pole changing switches controlling the circuits tosaid main power line, electro-magnetic control mechanisms for said polechanging switches, and a remote control for said control mechanismsembodying therein a car switch mechanism including a normally openopening switch in circuit with the electromagnet of one of said polechanging switches, a normally open closing switch in circuit with theelectro-magnet of the other of said v pole changing switches, and anormally closed stop switch in the circuits controlled by said openingand said closing switches respectively.

5. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the o osite sides thereof, and sheaves about w 1ch saidconnections pass, of an electric motor within the shaft associated witheach of said sheaves, gearing connectin each of said motors w1th itsassociate sheave, a main electric power line extending adjacent all ofsaid doors, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent said switch, pole changing switches including dooropening switches and door closing switches controlling the circuits tosaid main power line, electro-magnetic control mechanisms associatedrespectively with said door opening and said door closing switches, amaster time limit switch, including a normally closed switch mechanism,an electro-magnet operative thereon and in circuit therewith, and aswitch controllable by the electro-magnetic control for said dooropening switches and in circuit with the electro-magnets of said mastertime limit switch and the electro-magnet of the control for said dooropening switches. and a remote control mechanism embodying therein a carswitch mechanism including a normally open opening switch in circuitwith the electro-magnetic control mechanism for said door openingswitches and the electromagnet of said master time limit switch, meansclosing the circuit to said electro-magnet of said master time limitswitch independently of said opening switches, and a normally openclosing switch in circuit with the electro-magnet of the controlmechanism for said door closing switches.

6. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line ex-' tive thereon andin circuit therewith, and a switch controllable by the electro-magneticcontrol for said door opening switches and in circuit with theelectro-magnets of said master time limit switch and the electro-magnetof the control for said door opening switches, and a remote controlmechanism embodying therein a car switch mechanism including a normallyopen opening switch in circuit with the electro-magnetic controlmechanism for said door opening switches and the electro-magnet ofsaidmaster time limit switch, a normally open closing switch in circuitwith the electro-magnet of the control mechanism for said door closingswitches, and a normally closed stop switch in circuit with said openingand said closing switch respectively, and with the electromagnet of saidmaster time limit switch.

7. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid secti ons at the opposite sides thereof, and

sheaves about which said connections pass,

of an electric motor within the shaft associated with each of saidsheaves, gearing connecting each of said motors with its associatedsheave, a main electric power line extending adjacent all of saiddoors,'branch lines extending therefrom adjacent each door and connectedwith the motors adjacent such door, a normally open switch in each ofsaid branch lines adapted to be operated only when a car is positionedadjacent said switch, pole changing switches controlling the circuits tosaid main power line, electro-magnetic control mechanisms for said polechanging switches, and a remote control for said control mechanismsembodying therein a car switch mechanism including a normally openopening switch in circuit with the electro-magnet of one of said polechanging switches, a normally open closing switch in circuit with theelectro-magnet of the other of said pole changing switches, a hallswitch adjacent each door embodying therein a normally open openingswitch in a branch circuit from the circuit controlled by the openingswitch of the car switch mechanism, and a normally open closing switchin a branch circuit from the circuit controlled by the closing switch ofsaid car switch mechanism, and a normally open shaft switch in thecircuits controlled by both switches of said hall switch mechanism.

8. A door operator embodying therein th combination with guides withinan elevator shaft, a series of elevator doors each having sectionsVertically and oppositely movable on said guides, connections betweensaid sec tions at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft assolinesextending therefrom adjacent each door and connected with themotorsadjacent such door, a normally open switch in each of said branch linesadapted to be operated only when a car is positioned adjacent saidswitch, pole changing switches including door opening switches and doorclosing switches controlling the circuits to said main power line,electro-magnetic control mechanisms associated respectively with saiddoor opening and said door closing switches, a master time limit switch,including a normally closed switch mechanism, an electromagnet operativethereon and in circuit therewith, and a switch controllable by theelectro-magnetic control for said door opening switches and in circuitwith the electromagnets of said master time limit switch and theelectro-magnet of the control for said door opening switches, a remotecontrol mechanism embodying therein a car switch mechanism including anormally open opening switch in circuit with the electro-magneticcontrol mechanism for said door opening switches and the electro-magnetof said master time limit switch, means closing the circuit to saidelectro-magnet of said master time limit switch independently of saidopening switch, and a normally open closing switch in circuit with theelectro-magnet of thecontrol mechanism for said door closing switches, ahall switch adjacent each door, including a normally open opening switchin a branch circuit from the circuit controlled by the opening switch ofthe car switch mechanism, a normally open closing switch in a branchcircuit from the circuit controlled by the closing switch of said carswitch mechanism, and normally closed means in a branch circuit from themeans closing the circuit to said electro-magnet of said master timelimit switch, and a nor mally open shaft switch in the circuitscontrolled by the opening and closing switches of said hall switchmechanism.

9. A door operator embodying therein the M combination with guideswithin an elevator shaft, a series of elevator doors each havingsections vertically and oppositely movable on said guides, connectionsbetween said secti ons at the opposite sides thereof, and sheaves mainelectric power line extending adjacent all of sa d doors, branch linesextending therefrom adjacent each door and connected with the motorsadjacent such door, a normall open switch in each of said branch linesadapted to be operated only when a car is i positioned adjacent saidswitch, pole changing switches including door opening switches and doorclosing switches controlling the circuits to said main power line,electro-magnetic control mechanisms associated respectively with saiddoor opening and said door closing switches, a master time l1m1t swltch,including a normally closed switchmechanism, an electro-magnet operativethereon and in circuit therewith, and a switch controllable by theelectro-magnetic control for said door opening switches and in circuitwith the electro-magnets of said master time limit switch and theelectro-magnet of the control for said door opening switches, a remotecontrol mechanism embodying therein a car switch mechanism including anormally open opening switch in circuit with the electromagnetic controlmechanism for said door opening switches and the electro-magnet of saidmaster time limit switch, a normally open closing switch in circuit withthe electromagnet of the control mechanism for said door closingswitches, and a normally closed stop switch in circuit with said openingand said closing switch respectively, and with the electro-magnet ofsaid master time limit switch, a hall switch adjacent each door,including a normally open opening switch in a branch circuit from thecircuit controlled by the opening switch of the car switch mechanism, anormally open closing switch in a branch circuit from the circuitcontrolled by the closing switch of said car switch mechanism, and anormally closed stop switch in a branch circuit from the means closingthe circuit to said electro-magnet of said master time limit switch, anda normally open shaft switch in the circuits controlled by the openingand closing switches of said hall switch mechanism.

10. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line extending adjacent allof said doors, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent said switch, pole changing switches controlling thecircuits to said main power line, electro-magnetic control mechanismsfor said pole changing switches, and a remote control for said controlmechanisms embodying therein a car switch mechanism including a normallyopen opening switch circuit controlled by the closing switch of said carswitch mechanism, a normally open shaft switch in the circuitscontrolled by both switches of said hall switch mechanism, and anormally closed electro-magnetic switch, the contacts of which are inthe circuit controlled by the opening switch of the car switchmechanism, and the electro-magnet of which is energized as a result ofthe closing of the c1rcu1t to a motor for actuating the car. 11. A dooroperator embodying therein the comb nation with guides within anelevator shaft, a series of elevator doors each having sectlonsvertlcally and oppositely movable on said guldes, connections betweensaid sections at the opposite sides thereof, and sheaves about whlchsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of sa1d motors withits associated sheave, a main electric power line extending adjacent allof said doors, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car 1spositioned adjacent said switch, pole changing switches including dooropening switches and door closing switches controlhug the clrcults tosaid main power line, electro-magnetlc control mechanisms associatedrespectively with said door opening and said door closing switches, anda plurality of selectlvely actuated remote controls for said controlmechanisms embodying therein respectively a car switch mechanismincluding a normally open opening switch in circuit Wltll theelect-ro-magnet of one of said pole changing switches, and a normallyopen closing sw1tch 1n circuit with the electro-magnet of the other ofsaid pole changing switches, and a normally open magnetic switch thecontacts of which are in circuit with the elect-ro-magnet of said dooropening switches, and the magnet of which is in circuit with the sourceof power for actuating the micromechanism of an elevator equipment.

12. A door operator embodying therein the combination withguides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line extending adjacent allof said doors, branch lines extending therefrom adjacent each door andconnected with the motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car is'positioned adjacent said switch, pole changing switches including dooropening switches and door closing switches controlling the circuits tosaid mainpower line, electro-magnetic control mechanisms associatedrespectively with said door opening and said door closing switches, amaster time limit switch, including a normally closed switch mechanism,an electro-magnet operative thereon and in circuit therewith, and aswitch controllable by the electro-magnetic control for said dooropening switches and in circuit with the electro-magnets of said mastertime limit switch and the electro-magnet of the control for said dooropening switches, and a plurality of selectively actuated remotecontrols embodying therein respectively a car switch mechanism includinga normally open opening switch in circuit with the electromagneticcontrol mechanism for said door opening switches and the electro-magnetof said master time limit switch, means closing the circuit to saidelectro-magnet of said master time limit switch independently of saidopening switch, and a normally open closing switch in circuit with theelectromagnet of the control mechanism for said door closing switches,and a normally open magnetic switch the contacts of which are in circuitwith the electro-magnet of said door opening switches, and the magnet ofwhich is in circuit with the source of power for actuating themicro-mechanism of an elevator equipment.

13. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, gearing connecting each of said motors withits associated sheave, a main electric power line extending adjacent allof said doors, branch lines extending therefrom adjacent each door andconnected with the'motors adjacent such door, a normally open switch ineach of said branch lines adapted to be operated only when a car ispositioned adjacent said switch, pole changing switches including dooropening switches and door closing switches controlling the circuits tosaid main power line, electro-magnetic control mechanisms associatedrespectively with said door opening and said door closing switches, amaster time limit switch,

including a normally closed switch mechanism, an electro-magnetoperative thereon and in circuit therewith, and a switch icontrollableby the electro-magnetic control for;

said door opening switches and in circuit with the electro-magnets ofsaid master time limit switch and the electromagnet of the control forsaid door opening switches, and a plurality of selectively actuatedremote controls embodying therein respectivel a car 7 opening switch,and a normally open closin switch in circuit with the electro-magnet ofthe control mechanismfor said door closing switches, a normally openmagnetic switch the contacts of which are in circuit with theelectro-magnet of said door openin switches, and the magnet of which isin circuit with the source of power for actuating the micromechanism ofan elevator equipment, a hall switch adjacent each door, including anormally open opening switch in a branch circuit from the circuitcontrolled by the opening switch of the car switch mechanism, a normallyopen closing switch in a branch circuit from the circuit controlled bythe closing switch of said car switch mechanism, and normally closedmeans in a branch circuit from the means closing the circuit to saidelectro-magnet of said master time limit switch, a normally open shaftswitch in the circuits controlled by the opening and closing switches ofsaid hall switch mechanism, and a normally. closed electro-magneticswitch, the contacts of which are in the circuit controlled by theopening switch of the car switch mechanism, and the electro-magnet ofwhich is energized as a result of the closing of the circuit to a motorfor actuating the car.

14. A door operator embodying therein the combination with guides withinan elevator shaft, a series of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith each of said sheaves, a large gear carried by and rotatable witheach of said sheaves, a small gear carried by each of said motors andenmeshed with a large gear recuits to said main power line,electro-magnetic control mechanisms for said pole changing switches, andmeans whereby said control mechanisms may be selectively actuated from Ia remote point.

15. A door operator embodying therein the combination with uides withinan elevator shaft, a series of e evator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves about whichsaid connections pass, of an electric motor within the shaft associatedwith a sheave, gearing connectin said motor with its associated sheave,a mam electric power line extending adjacent all of said doors, a branchline extending therefrom adjacent each door and connected with the motoradjacent such door, a normally open switch in each of said branch lines,means carried by an elevator car adapted to co-operate with any of saidnormally open switches, whereby the circuit from said main line to amotor operative upon any door can be closed only when a car ispositioned adjacent said switch,

pole changing switches controlling the circuits to said main power line,electro-magnetic control mechanisms for said pole changing switches, andmeans whereby said control mechanisms may be selectively actuated from aremote point.

16. A door operator embodying therein the combination with uides withinan elevator shaft, a series of efiavator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves mounteduponvsaid guides about which said connections pass, of an electric motormounted upon one of'said guides adjacent a sheave, gearing connectingsaid motor with said sheave, a main electric power line extendingadjacent all of said doors, a branch line extending therefrom adjacenteach door and a normally open switch in each of said branch linesadapted to be operated only when a car is positioned adjacent saidswitch, pole changing switches controlling the circuits to said mainpower line, electro-magnetic control mechanisms for said pole changingswitches, and means whereby said control mechanisms may be selectivelyactuated from a remote point.

17. A door operator embod ing therein the combination with guides wit 'nan elevator shaft, a series'of elevator doors each having sectionsvertically and oppositely movable on said guides, connections betweensaid sections at the opposite sides thereof, and sheaves mounted u onsaid guides respectively about which sai connections pass, of anelectric motor mounted upon said guides respectively adjacent saidsheaves, gearing connecting said motors respectively with the adjacentconnected with the motor adjacent such door,

switches, and means whereby said control mechanisms may be selectivelyactuated from asremote point.

In witness whereof I have hereunto afiixed my signature this 23d day ofAugust, 1929.

ROBERT S. PEELLE.

